Rockingham County
New Hampshire — Natural Disaster Risk Assessment
MediumComposite Risk Score
National percentile: 86th
Rockingham County faces medium composite natural disaster risk (NRI Risk Index score 85.8, 86th national percentile), driven primarily by coastal flood and ice storm exposure. Expected annual loss across all 18 hazard types is $90M.
Source: FEMA National Risk Index v1.20 · Updated December 2025
Top Hazards
All 18 Hazard Risks
| Coastal Flood | High | 8.03 / yr | $12M |
| Ice Storm | High | 2.03 / yr | $2M |
| Riverine Flood | Medium | 1.21 / yr | $54M |
| Earthquake | Low | 0.00 / yr | $5M |
| Hurricane | Medium | 0.14 / yr | $5M |
| Drought | Medium | 5.59 / yr | $1M |
| Lightning | Medium | 19.84 / yr | $911K |
| Tornado | Medium | 0.12 / yr | $4M |
| Strong Wind | Medium | 0.84 / yr | $2M |
| Landslide | Low | 0.59 / yr | $11K |
| Winter Weather | Medium | 17.08 / yr | $169K |
| Heat Wave | Low | 4.22 / yr | $1M |
| Cold Wave | Low | 1.40 / yr | $2M |
| Wildfire | Very Low | 0.00 / yr | $64K |
| Hail | Low | 2.02 / yr | $226K |
| Avalanche | Very Low | 0.01 / yr | $3 |
| Tsunami | Very Low | 0.00 / yr | $0 |
| Volcanic Activity | Very Low | 0.00 / yr | $0 |
Frequently Asked Questions
What is the overall natural disaster risk for Rockingham County?
Rockingham County has a composite FEMA National Risk Index score of 85.8 out of 100, placing it in the Medium category and the 86th national percentile. This combines Expected Annual Loss, Social Vulnerability, and Community Resilience across 18 hazard types.
What are the top natural hazards in Rockingham County?
The three highest-rated hazards are Coastal Flood (High, $12M EAL), Ice Storm (High, $2M EAL), Riverine Flood (Medium, $54M EAL). These account for most of the county's expected annual losses.
How does Rockingham County compare to other New Hampshire counties?
Rockingham County ranks #2 of 10 New Hampshire counties for overall natural disaster risk, with a medium rating.
What does Expected Annual Loss (EAL) mean?
EAL is FEMA's estimate of average annual dollar losses from natural hazards, calculated from historical event data and exposure models. Rockingham County's $90M EAL is a statistical average, not a guarantee for any specific year or address.